Please answer this question ma'am/sir. Show the solution. Thank you.

POSSIBLE POINTS Two different analytical methods were used to determine residual chlorine in sewage effluents. Both methods were used on the same samples Two methods were used to determine the concentration of CI in mg/L, and the results are shown in the following table: Sample Method A Method B 0.39 0.36 0.84 1.35 1.76 2.56 3.35 3.92 4.69 5.35 7.70 8.33 10.52 10.70 10.92 10.91 Do the methods differ significantly at a 90% confidence level. How about at 50% confidence level